Once your here you will think that's an even more dangerous idea. A good harness with metal fasteners( Not A Collar) with tied leash or seat belt has worked the best for us. I'm overprotective and double tie them because my small dog. A Jack, is also a Houdini. Just make sure it is short enough that they can't jump over the edge. Good for you for thinking of this. I have seen a few dogs in my years here injured pretty badly from not being secured.
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